I keep crashing randomly.

So I keep crashing.

Here's my log.

http://www.mediafire.com/view/48y785isakmkquh/mlog.txt

Sacrificed a level 30 item and then crashed ;[ rip

Does it happen all the time or only at certain moments during quest mode?

It's only been happening during quest. It's usually happened maybe 10 seconds into the round starting, but I think I recall it happening once while I was mid quest.

Next time you crash, don't start FGunZ.
Head over to your FGunZ folder and find the latest .dmp file for example;
Gunz_2015-02-14_16-21-25.dmp

Upload it on mediafire and send it to Mike/Linear (developers).